What could be the biggest summer of Alex de Minaur’s career gets underway tonight as he represents the green and gold in the United Cup.

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Australia’s hopes of a first team title since the 2016 Hopman Cup will rely on de Minaur and Aussie women’s No.1 Olivia Gadecki making a strong start in their first group-stage tie against Argentina.

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The hosts will be favoured to win at Sydney’s Ken Rosewall Arena, with a pair of three-set singles matches beginning at 5:30pm EDT.

World No.97 Gadecki has a golden opportunity against world No.100 Nadia Podoroska, before world No.9 de Minaur faces clay court specialist Tomas Martin Etcheverry, who is the nation’s third-ranked male at world No.39.

MATCH CENTRE: Olivia Gadecki vs Nadia Podoroska live score and updates

MATCH CENTRE: Alex de Minaur vs Tomas Martin Etcheverry live score and updates

De Minaur needs a strong United Cup performance to boost his chances of moving up into the ATP top eight, which would give him a gentler draw at the Australian Open.

He is looking to pass Russia’s Andrey Rublev, who is just a handful of points ahead of the Sydneysider, but is the No.1 seed at the Hong Kong Open beginning in a few days’ time.

With both men defending good points – Rublev winning the most recent Hong Kong event, and de Minaur making the semi-finals of the 2024 United Cup – it’ll be a race to see who can repeat or improve on 12 months ago.

Tonight’s tie will finish with mixed doubles, with Ellen Perez and Matt Ebden facing Podoroska and Etcheverry.

Australia’s second and final group stage tie will be on January 1, against de Minaur’s fiance Katie Boulter’s Great Britain.

Follow Australia vs Argentina in the United Cup live below!